1.21.0
Added
- Ability to add a picture to the background of the comment. Supports four image formats: png, jpeg, gif, bmp. New 
Comment::setSizeAsBackgroundImage()to change the size of a comment to the size of a background image. Issue #1547 PR #2422 - Ability to set default paper size and orientation PR #2410
 - Ability to extend AutoFilter to Maximum Row PR #2414
 
Changed
- Xlsx Writer will evaluate AutoFilter only if it is as yet unevaluated, or has changed since it was last evaluated PR #2414
 
Deprecated
- Nothing
 
Removed
- Nothing
 
Fixed
- Rounding in 
NumberFormatterIssue #2385 PR #2399 - Support for themes Issue #2075 Issue #2387 PR #2403
 - Read spreadsheet with 
#in name Issue #2405 PR #2409 - Improve PDF support for page size and orientation Issue #1691 PR #2410
 - Wildcard handling issues in text match Issue #2430 PR #2431
 - Respect DataType in 
insertNewBeforePR #2433 - Handle rows explicitly hidden after AutoFilter Issue #1641 PR #2414
 - Special characters in image file name Issue #1470 Issue #2415 PR #2416
 - Mpdf with very many styles Issue #2432 PR #2434
 - Name clashes between parsed and unparsed drawings Issue #1767 Issue #2396 PR #2423
 - Fill pattern start and end colors Issue #2441 PR #2444
 - General style specified in wrong case Issue #2450 PR #2451
 - Null passed to 
AutoFilter::setRange()Issue #2281 PR #2454 - Another undefined index in Xls reader (#2470) Issue #2463 PR #2470
 - Allow single-cell checks on conditional styles, even when the style is configured for a range of cells (#) PR #2483